Hello Mister White,  there is a workshop in Southern Germany where
those instruments are built (the "Tanzbaer").  It's a Mister Blueml
in Grassau.  Look in the Internet at http://www.drehorgelwerkstatt.de/

Mister Blueml is producing very good instruments.  He told me that his
handicap is that his English is very poor and he is looking only twice
a month for emails.

  Drehorgelbau Blueml
  Alois Blueml
  Achentalstr. 11
  D-83224 Grassau
  Germany
  Tel: +49 8641 1457
  fax: +49 8641 598964
  http://www.drehorgelwerkstatt.de/
  email:info@drehorgelwerkstatt.de

If you can speak German (or if you have a friend who can), try to get
in contact by phone (better chance to get in contact with him).

Kind regards
Hauke Marxsen